What if it switches back between ipv4 and 6? I've seen that some days when I put in "whats my ip" to google it sends back an ipv6 address but today I did it and its ipv4. I thought once your area or ISP switched you didnt go back.

I was wondering that too. Had IPV6 working on my Tomato/6120 setup last week then find today that it was broken again. Bunch of reboots and some settings modification (eventually ending back to what it originally was anyway) and its back again.

What if it switches back between ipv4 and 6? I've seen that some days when I put in "whats my ip" to google it sends back an ipv6 address but today I did it and its ipv4. I thought once your area or ISP switched you didnt go back.

Your correct, but you should have what we call Dual-Stack so both an IPv4 address and an IPv6 address. Check your ipconfig and make sure you have both.